Faster serialization of x+x+x+x+x.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25891 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] Should fix #1645, inter(y=1,y=0), randpoly leading coefficient != 1 

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25892 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Profiling for string serialization -- to be removed soon

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25893 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25894 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e